Reminds me of Perl's CGI.pm from about 25 years ago:

https://metacpan.org/dist/CGI/view/lib/CGI/HTML/Functions.po...

Sounds interesting, but I didn’t see any actual code. Is this for Clojure?

Related: I was able to get pure s-expression pages using Parenscript, Spinneret, and cl-css in Common Lisp.

Looks great. I would use it right now if it was available. One question is: what the reactivity architecture would look like on the compiled bundle?